44 lines
976 B
C
44 lines
976 B
C
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/**
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* Example for a interpolated sine/cosine table lookup
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*
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* modified by true to work in 8 bits, and to fix cos7 function
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*
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*/
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#ifndef INC_MATH_SIN7_H_
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#define INC_MATH_SIN7_H_
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#include <stdint.h>
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/**
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* Sine calculation using interpolated table lookup.
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* Instead of radians or degrees we use "turns" here. Means this
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* sine does NOT return one phase for 0 to 2*PI, but for 0 to 1.
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* Input: -1 to 1 as int8 "Q7" == -128 to 127.
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* Output: -1 to 1 as int8 "Q7" == -128 to 127.
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*
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* @param int8_t angle Q7
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* @return int8_t Q7
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*/
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int8_t sin7(int8_t angle);
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/**
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* Cosine calculation using interpolated table lookup.
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* Instead of radians or degrees we use "turns" here. Means this
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* cosine does NOT return one phase for 0 to 2*PI, but for 0 to 1.
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* Input: -1 to 1 as int8 "Q7" == -128 to 127.
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* Output: -1 to 1 as int8 "Q7" == -128 to 127.
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*
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* @param int8_t angle Q7
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* @return int8_t Q7
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*/
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int8_t cos7(int8_t angle);
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#endif /* INC_MATH_SIN7_H_ */
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